Steam-boiler.



'UNITED STATES- PATENT OFFICE.

BENJAMIN F. JACKSON, OF NORTH CAMBRIDGE, MASSACHUSETTS, ASSIGNOR OF THREE-FOURTHS TO JOSEPH W. LOVETT, OF WOLLASTON, MASSA- CHUSETTS, WILLIAM R. REEVE, OF DORCHESTER, MASSACHUSETTS, AND MAURICE DOUGLAS FLATTERY, OF BOSTON, MASSACHUSETTS.

USTEAM-BOILEIR.

SPECIFICATION forming part of Letters Patent No. 690,730, dated January 7, 1902. Application filed April-2,1901. Serial No. 54,0 2. on; an.)

To all whom it may concern:-

Be it known that I, BENJAMIN F. JAcKsoN, a

citizen of the United States, residing at North Cambridge, in the county of Middlesezc and State of Massachusetts, have inventedcertain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings;

This invention has referenceto improve ments in steam-boilers, and particularly in water-tube boilers.

The object of the invention" is to increase the strength of'a water-tube boiler.

Another object of the invention is to so construct a water-tube boiler that the outer shell may be cylindrical in shape.

Another object of the invention is to more thoroughly superheat the steam.

Another object of the invention is to. provide means for vaporizing fluid fuel.

Another object of the invention is to improve the general construction of water tube boilers.

cured together and a cylin drical shell embracing the tube-chamber. v

The invention consists in a cylindrical.

3 5 drical outer shell, the rectangular tube-cham ber secured in a rectangular opening in. the bottom of said shell, whereby the lower portion of the outer shell forms a water-reservoir and the upper part. thereof forms 'a steam- 0 dome, a series of outlets extending from the interior of the tube-chamber throughsaid steam-dome, and a steam-pipe having its mouth located between said outlets.

The invention also consists in the tubechamber, the outlets therefrom, and the steamsupply pipe coiled above said outlets.

The invention also consists in the series of outlets extending from the tube-chamber and in the means by which said outlets are secured in the crown-sheet.

for vaporizing the fluid fuel.

The invention consists in a watertube boiler having a series of flat tube-sheets se-.

The invention also consists in the means The invention also consists in such other novel features of construction and combination of parts as'shall hereinafter be more fully described, and pointedout in the claims.

, Figure 1 represents a vertical sectional view of the improved boiler. Fig. 2 represents a plan view, partially in section, of the same.

Similar numbers of reference designate corresponding parts throughout.

In carrying this invention into practice it has been my object to so constructa water-tube boiler that it shall combine the strength of the cylindrical shell with the advantages of the water-tube syste'm,'thereby being inter- "changeable with the fire-tube boilers at present used in motor-vehicles, and providing a boiler less liable toinjury from the burning out of the tubes. No less importantis the construction whereby a jointless vaporizing-tube is so located that no leakage therefrom into the furnace is possible, while the importance of the means for superheating the steam is also great.

In the drawings, 5 represents a cylindrical shell having upper and lower annular flanges v 6 and 7. To the flange 7 is secured the plate 8, having perforations to receive the waterinlet pipe 9 and the fuel-supply pipe 10 at one side and at the other side a perforation through which the fuel-supply pipe extends to connect with the furnace, as 11, of any ordinary'construction, the plate 8 being also furnished with a central rectangular opening above the furnace.

Secured to the plate 8 above the rectangu lar opening is a rectangular chamber 12, open at the bottom and having sides 13 13 and the top 14. In perforations of the sides 13 13 are secured cross layers of water-tubes 15 and 16, which thus connect with the space.between the sides of the chamber 12 and the cylindrical shell. I

Formed in the top 14 is a series of openings 5 in which the flues 17 17 are secured. These flues have shoulders at their upper ends to bear against the lower surface of the crownsheet 18, furnished with suitable openings, an the nuts 19 19 are provided for screwing too onto the ends of said flues 17 17, which extend through the opening in the crown-sheet, thus strongly bracing this sheet above the tube-chamber 12, while the outer edge of the same is secured to the flange 6 of the cylindrical shell.

In a central perforation of the crown-sheet is secured the open end of the steam-supply pipe 20, which is coiled above the open ends of the flues, while above the crown-sheet 18 is secured the chamber 21 for receiving the products of combustion passing through the flues 17 and having a funnel for directing such products into the open air or through some well-known muffler.

It is of course understood that the joints between the various parts are suitably tight for the purposes in view.

WVater being supplied to the shell 5 through the feed-pipe 9 from any feed-water heater fills the shell 5 and and the tubes 15 and 16 to approximately the height shown in Fig. 1 of the drawings. from the furnace pass between the tubes 15 and 16 as heated gases, raising the temperature of the water in the tubes and causing the water to circulate toward the upper portion of the shell, which it reaches in the form of steam. In seeking an outlet the steam passes between the flues 17 17, which being heated by the hot gases passing therethrough superheat the steam before it passes into the steam-supply pipe 20. This pipe being coiled above the open ends of the fines 17 17 receives a large proportion of the heated gases passing through the fines, causing a further superheating of the steam and delivering the steam in a very expansive condition.

The fluid fuelsupply pipe 10, passing through the water-shell of the boiler and over the tube-chamber, is subjected to sufficient heat to thoroughly vaporize the fuel, the close connection of this pipe with the furnace tending to maintain this degree of vaporization until the fuel reaches the furnace. At the same time it will be seen that the main portion of this fuel-pipe is so protected that .accidental leakage of fuel therefrom will be received into the boiler-shell, and such fuel cannot pass to the furnace, as has heretofore been an objectionable feature of the use of fluid fuel in motor-vehicles.

Reference to Fig. 2 of the drawings will indicate the relatively large proportion of water located at the open ends of the tubes by the combination of the rectangular tubechamber with the cylindrical shell. It is found that this improves the circulation of the water through the tubes, while the liability of the foaming of the water and steam is diminished.

The use of the nuts 19 facilitates the removal of the crown-sheet 18 to permit of access to the interior of the shell 5 for the examination and repair of any of the inclosed mechanism.

The products of combustion,

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination with a rectangular tubechamber furnished at its lower end with a base, fixed thereto and having a central opening, and at its upper end with a flue having a screw-thread, of a cylindrical shell embracing the tube-chamber and removably secured to said base, and having at its upper closed end an opening to receive the flue end, and a nut screwed onto the end of the flue and bearing against the shell-top, as and for the purpose described.

2. A steam-boiler comprising a cylindrical casing provided at one end with a plate having an opening, a water-tube chamber secured to such plate and having an open end and an end closed, and a fiuidfuel-supply pipe located between the shell and the tube-chamher.

3. A boiler comprising a cylindrical shell provided with end plates one of which has an opening, a rectangular water-tube chamber secured therein and having a closed end, a series of fines connecting the interior of said tube-chamber with the exterior of the closed end of the shell, and a steam-pipe centrally disposed with relation to said fiues.

4. In a steam-boiler, the combination with the cylindrical shell having the ends, one of which has a rectangular opening, the rectangular water-tube chamber secured to such plate above said opening and having the top plate supplied with a series of openings, and the flues secured in said top plate, of the steam-pipe extending through an opening of the end plate of the shell and coiled above the open ends of the fines.

5. In a boiler, the combination with the cylindrical shell having the closed upper end, and the rectangular water-tube chamber mounted within the shell and connected with the closed end thereof by fines, of the fluidfuel-supply pipe extending between the shell and the tube-chamber and over the top of said chamber, as described.

6. The combination with the shell 5 provided with the plate 8, the tube-chamber 12 secured to said plate 8 and provided with the top 14 and with tubes 15 and 16, the fines 17 secured ill-openings in the top 14, the crownsheet 18 secured at its edges to the shell 5, and having openings through which the fines 17 extend, and the nuts 19 secured to the ends of said fines, of the steam-supply pipe 20 extending through a central perforation in the crown-sheet and coiled above the ends of the fines 17, as described.

In testimony whereof I afiix my signature in presence of two witnesses.

BENJAMIN F. JACKSON.

\Vitnesses:

W. STANLEY CAMPBELL, H. J. MILLER. 

